A **drain opener tool** is a device or chemical substance used to clear clogs or blockages in plumbing systems, specifically in drains. These tools are designed to break down or dislodge debris, such as hair, grease, soap scum, or food particles, that have accumulated and caused a blockage in sinks, tubs, or other drains.

There are two primary types of drain opener tools:

1. **Chemical Drain Openers:**
These are liquid or gel-based products, often containing caustic or corrosive chemicals like sodium hydroxide or sulfuric acid, that work by dissolving the materials causing the blockage. Chemical drain openers are widely available and easy to use, but they can be harmful to pipes if overused and may also pose safety risks if not handled properly.

2. **Mechanical Drain Openers:**
These include physical tools such as drain snakes, plungers, or augers, which are used to manually remove or break up the clog. A **plunger** creates suction to dislodge the blockage, while a **drain snake** (or auger) is a long, flexible coil that can be fed into the drain to break up or pull out the obstruction.

Both methods can be effective, but it's important to use the right tool or chemical based on the type and severity of the blockage.